Logan International Airport is raising parking rates for the second time in two years, with a third price hike approved for 2016, as the airport attempts to discourage people from using its overcrowded terminal lots while it also adds revenue to build additional spaces.

Prices will go up to $29 a day in the central garage and $20 a day in the economy lot on July 1, up $2 a day. Fees will go up again in July of 2016, by $3 a day.

The cost of the first hour will remain unchanged; beyond that, charges will go up incrementally.

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Logan’s lots exceed capacity more than 50 times a year, forcing the airport to valet park or divert more than 70,000 cars in the last 12 months. The cost to operate the parking garages increased about $2.5 million last year and is expected to keep rising as the number of passengers grows.

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The airport plans to start construction later this year on 2,050 new spaces in the Central and Terminal B garages, at an estimated cost of $60 million. Rates at the four suburban Logan Express parking lots will remain the same, at $7 a day.